Self-tripping pulley-block



(No Model.) Q

O. MA-TH'ESON. SELF TRIPPING PULLEYBLocK;

No. 504,928. Petented Sept. 12, 1893.,

WITNESSES. f INVENTOH d ta 16 B'y 3 M e ATTORNEYS.

UNITED. STATES! PATENT OFFICE.

COLIN MATHESON, OF EUREKA, CALIFORNIA.

SELF-TRIPPING APULLEY-BLOCK.

SPEGIFIGATIONfOrming part of Letters rfatent No. 504,928, datedSeptember 12, 1893.

Application filed June 8, 1893.

To to whom it may concern.-

Be it known that I, COLIN MATHESON, of Eureka, in the county of Humboldtand State of California, have invented a new and Improved Self-TrippingPulley-Block, of which the following is a full, clear, and exact description.

My invention relates to improvements in that class of pulley blockswhich are used in connection with cables for drawing logs, cars, orother loads, and the object of my invention is to produce a pulley blockwhich is particularly advantageous in carrying the loads referred toaround curves, and which at such curves, trips the branch cables whichcarry the load directly, so that the cables may swing outward from theblock and facilitate a good turn. This obviates the necessity ofdragging the cables on the ground, and enables the load to be carriedeasily and with comparatively little wear and tear on the pulley blocks.

To these ends, my invention consists in certain features of constructionand combinations of parts, as will be hereinafter more fully describedand pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in all the views.

Figure 1 is a broken perspective view, illustrating the manner in whichmy improved pulley block is used. Fig. 2' is an enlarged side elevationof the pulley block; and Fig. 3 is an edge view of the same, with thetripping wheel or pulley partly in section.

The block 10 is of substantially the usual kind, having a guard 1O nextthe pulleys, and its upper end 11 doubled over to form a convenientsupport for the upper grooved pulley 12, which is of substantially theusual kind, and its lower end doubled in the customary way, as shown at13, to form a support for my improved pulley 14, a space being leftbetween the two pulleys and the doubled ends of the block, in whichthebranch cable may swing as hereinafter described. The

block is provided with the usual swivel hook 15 at its upper end, andthe customary eye 16 at its lower end to which a rope or chain maySerial No. 476,926. (No model.)

be made fast, to assist in holding the pulley block when necessary.

The pulley 14 which forms the most essential part of my invention isprovided with a face groove 17, in which the main cable 18 runs, and onthe outer edge of the pulley are cogs 19, which are adapted to engagethe branch cable 20, and lift the cable from the face of the pulley sothat it may swing outward, as shown in Fig. 1, thus enabling the loadcarried by .the pulley to swing easily around a curve, while the maincable 18 runs in the groove 17 of the pulley 1 1.

The use of the pulley block is illustrated in Fig. 1, which representsthe main cable going around a curve, at which points the improved selftripping pulley block is especially valuable. The branch cable 20 isspliced to the main cable in the usual way, and connected by a suitablefastening 2O with alog 21, which is to be dragged along by the maincable, but it will be understood that instead of the log, the cable maybe applied to a car or to any other load. The hook 15 of the pulleyblock is secured to a chain 22, which is made fast to a stump, tree, orany convenient support at the curve of the cable. When the cable 18 isrunning along a straight line, the branch cable 20 will hang beneath it,and the load will travel along in the usual way, and when a curve isreached, the branch cable will naturally swing out slightly, and beingengaged by the cogs 19, will be lifted from the face of the pulley 14,and permitted to swing out from the open side of the block, asillustrated in Fig. 1, and thus run smoothly around the curve.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. As an improved article of manufacture, a pulleyblock having an open side, a pulley journaled inthe upper portion of theblock, and a second pulley journaled in the lower portion and providednear one edge with proj eeting cogs, substantially as specified.

2. The combination, with the main cable and the branch cable thereon, ofthe pulley block having an open side, a pulley journaled in the upperportion of the block, above the said opening, and a second pulleyjournaled in the lower portion of the block and provided at its outeredge with projecting cogs, substantially as specified.

5 3. As an improved article of manufacture, a-pulley block having a sideopening, a pulley journaied in the block above the opening, and a secondpulley journaled in the block be low the opening, the second pulleyhaving a grooved face to receive the cable and project- 10 ing cogs atits outer edge, substantially as specified.

COLIN MATHESON. Witnesses:

FRED. WV. BELL, FRANK J. REID.

